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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross reserve for loss and loss expense, at beginning of period $ 5,144,821 $ 4,580,903
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period 757,513 578,641
Net reserve for loss and loss expense, at beginning of period 4,387,308 4,002,262
Incurred loss and loss expense for claims occurring in the current year 580,408 508,299
Prior year development (12,970) (14,063)
Total incurred loss and loss expense 567,438 494,236
Paid loss and loss expense for claims occurring in the current year 91,011 91,292
Paid loss and loss expense for claims occurring in the prior years 418,194 312,926
Total paid loss and loss expense 509,205 404,218
Net reserve for loss and loss expense, at end of period 4,445,541 4,092,280
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 653,909 552,111
Gross reserve for loss and loss expense, at end of period $ 5,099,450 $ 4,644,391